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 * from this software without specific prior written permission.
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 * This software is provided "AS IS," without a warranty of any 
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package de.blacksheep.jmoteextract.remote.socket.xor;

import java.io.*;
import java.util.logging.Level;
import java.util.logging.Logger;

class XorOutputStream extends FilterOutputStream {
  
    /*
     * The byte used to "encrypt" each byte of data.
     */
    private final byte pattern;
    
    private static final Logger LOGGER =  Logger.getLogger(XorOutputStream.class.getName());
  
    /* 
     * Constructs an output stream that uses the specified pattern
     * to "encrypt" each byte of data.
     */
    public XorOutputStream(OutputStream out, byte pattern) {
        super(out);
	this.pattern = pattern;
    }
  
    /*
     * XOR's the byte being written with the pattern
     * and writes the result.  
     */
    public void write(int b) throws IOException {
       LOGGER.log(Level.FINE, "Writing {0}...", b);
       
       out.write((b ^ pattern) & 0xFF);
    }
}